Question

at a constant pressure at a temperature of 280 k the gas in the cylinder has the volume of 10 liters if the volume of the gas is increased to 20 liters what is the new temperature

Answer 1

Since there is constant pressure, you can use Charles's Law:

V1/T1 = V2/T2

10L/280K = 20L/T

0.0357 = 20/ T

T = 20/0.0357

T = 560K which is the new temperature